/*
 * ***** BEGIN GPL LICENSE BLOCK *****
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
 *
 * ***** END GPL LICENSE BLOCK *****
 */

/** \file value2d_gizmo_group.c
 *  \ingroup edgizmolib
 *
 * \name 2D Value Gizmo
 *
 * \brief Gizmo that edits a value for operator redo.
 */

#include "BLI_utildefines.h"

#include "BKE_context.h"

#include "ED_undo.h"
#include "ED_screen.h"
#include "ED_gizmo_library.h"

#include "UI_resources.h"

#include "MEM_guardedalloc.h"

#include "RNA_access.h"

#include "WM_api.h"
#include "WM_types.h"

/* -------------------------------------------------------------------- */
/** \name Value Gizmo
 * \{ */

struct ValueOpRedoGroup {
	wmGizmo *gizmo;
	struct {
		const bContext *context;  /* needed for redo. */
		wmOperator *op;
	} state;
};

static void gizmo_op_redo_exec(struct ValueOpRedoGroup *igzgroup)
{
	wmOperator *op = igzgroup->state.op;
	if (op == WM_operator_last_redo((bContext *)igzgroup->state.context)) {
		ED_undo_operator_repeat((bContext *)igzgroup->state.context, op);
	}
}

/* translate callbacks */
static void gizmo_value_operator_redo_value_get(
        const wmGizmo *gz, wmGizmoProperty *gz_prop,
        void *value_p)
{
	float *value = value_p;
	BLI_assert(gz_prop->type->array_length == 1);
	UNUSED_VARS_NDEBUG(gz_prop);

	struct ValueOpRedoGroup *igzgroup = gz->parent_gzgroup->customdata;
	wmOperator *op = igzgroup->state.op;
	*value = RNA_property_float_get(op->ptr, op->type->prop);
}

static void gizmo_value_operator_redo_value_set(
        const wmGizmo *gz, wmGizmoProperty *gz_prop,
        const void *value_p)
{
	const float *value = value_p;
	BLI_assert(gz_prop->type->array_length == 1);
	UNUSED_VARS_NDEBUG(gz_prop);

	struct ValueOpRedoGroup *igzgroup = gz->parent_gzgroup->customdata;
	wmOperator *op = igzgroup->state.op;
	RNA_property_float_set(op->ptr, op->type->prop, *value);
	gizmo_op_redo_exec(igzgroup);
}

static void WIDGETGROUP_value_operator_redo_modal_from_setup(
        const bContext *C, wmGizmoGroup *gzgroup)
{
	/* Start off dragging. */
	wmWindow *win = CTX_wm_window(C);
	wmGizmo *gz = gzgroup->gizmos.first;
	wmGizmoMap *gzmap = gzgroup->parent_gzmap;
	WM_gizmo_modal_set_from_setup(
	        gzmap, (bContext *)C, gz, 0, win->eventstate);
}

static void WIDGETGROUP_value_operator_redo_setup(const bContext *C, wmGizmoGroup *gzgroup)
{
	struct ValueOpRedoGroup *igzgroup = MEM_mallocN(sizeof(struct ValueOpRedoGroup), __func__);

	igzgroup->gizmo = WM_gizmo_new("GIZMO_GT_value_2d", gzgroup, NULL);
	wmGizmo *gz = igzgroup->gizmo;

	igzgroup->state.context = C;
	igzgroup->state.op = WM_operator_last_redo(C);

	gzgroup->customdata = igzgroup;

	UI_GetThemeColor3fv(TH_GIZMO_PRIMARY, gz->color);
	UI_GetThemeColor3fv(TH_GIZMO_HI, gz->color_hi);

	WM_gizmo_target_property_def_func(
	        gz, "offset",
	        &(const struct wmGizmoPropertyFnParams) {
	            .value_get_fn = gizmo_value_operator_redo_value_get,
	            .value_set_fn = gizmo_value_operator_redo_value_set,
	            .range_get_fn = NULL,
	            .user_data = igzgroup,
	        });

	/* Become modal as soon as it's started. */
	WIDGETGROUP_value_operator_redo_modal_from_setup(C, gzgroup);
}

static void WIDGETGROUP_value_operator_redo_refresh(const bContext *UNUSED(C), wmGizmoGroup *gzgroup)
{
	struct ValueOpRedoGroup *igzgroup = gzgroup->customdata;
	wmGizmo *gz = igzgroup->gizmo;
	wmOperator *op = WM_operator_last_redo((bContext *)igzgroup->state.context);
	wmGizmoMap *gzmap = gzgroup->parent_gzmap;

	/* FIXME */
	extern struct wmGizmo *wm_gizmomap_modal_get(struct wmGizmoMap *gzmap);
	if ((op != igzgroup->state.op) ||
	    (wm_gizmomap_modal_get(gzmap) != gz))
	{
		WM_gizmo_group_type_unlink_delayed_ptr(gzgroup->type);
	}
}

static void WM_GGT_value_operator_redo(wmGizmoGroupType *gzgt)
{
	gzgt->name = "Value Operator Redo";
	gzgt->idname = "WM_GGT_value_operator_redo";

	/* FIXME, allow multiple. */
	gzgt->flag = WM_GIZMOGROUPTYPE_3D | WM_GIZMOGROUPTYPE_TOOL_INIT;

	gzgt->gzmap_params.spaceid = SPACE_VIEW3D;
	gzgt->gzmap_params.regionid = RGN_TYPE_WINDOW;


	gzgt->setup = WIDGETGROUP_value_operator_redo_setup;
	gzgt->refresh = WIDGETGROUP_value_operator_redo_refresh;
}

/** \} */

/* -------------------------------------------------------------------- */
/** \name Public API
 * \{ */

void ED_gizmogrouptypes_value_2d(void)
{
	WM_gizmogrouptype_append(WM_GGT_value_operator_redo);
}

/** \} */
